Much attention have been given to tachyon field models in last few decades in string theory and cosmology [1]}-[2]}.
In fact, isotropic cosmological models whose radius depends on time and their
potential can be constructed using minimally coupled scalar field model [3]}.
Since the same procedure for the correspondence between minimally coupled scalar field models and tachyon can be utilize
to study the similar cosmological evolution [2]}.
The energy and pressure densities for the tachyone fiels model are expressed as
\(\rho =\frac{V(\phi )}{\sqrt{1-\dot{\phi }^{2}}},~~~~~~ p=-V(\phi )\sqrt{1-\dot{\phi }^{2}}.\) 
